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In page Grand Prix World Championship:

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The future of the GPWC was cast into doubt in mid-January 2005 when Ferrari, FIAT's F1 team, announced it had secretly come to terms with Ecclestone and signed an extension to the Concorde Agreement for a one off payment amounting to 100 million dollars (US). Ecclestone expressed his expectation that the remaining teams would shortly follow suit despite the initial 40 million dollar (US) offer being retracted. However, at around the same time Honda and Toyota showed interest in working together with GPWC.